Which of the following elements can be involved in `ppi-dpi` bonding?

Which of the following elements can be involved in p pi- d pi bonding ?

Which of the following elements can be involved in p pi- d pi bonding ?

Which of the following elements can be involved in p pi -d pi bonding

Which of the following is not involved in dpi -dpi overlap:

The molecule in which an atom is associated with more than 8 electrons is known as hypervalent molecule and less than 8 electrons is known as hypovalent molecule. All hypervalent molecules must have ppi-dpi bonding but the molecules having back bonding back boding need not to have always ppi-dpi bondin. Q.Which of the following molecule is not having ppi-dpi bonding: